Defence
Arsenal's back line hasn’t really been consistent this season as they have looked disorganized and out of sorts at times. This was mainly due to the long absence of their captain and obviously best defender Laurent Koscielny.
The French international is now back, and though not fully up to speed yet, he’s still their best choice to marshal their defence. Of course, Emery brought in Sokratis, but let's face it; he hasn't gotten into the Premier League rhythm quite yet.
Emery will want to put up a back three against Chelsea so as to have a solid platform for their attacking players. With Laurent Koscielny available for selection the manager will really be relieved
With that in mind, the three players that will likely lineup in that back three are Stephen Lichtsteiner on the right, Sokratis through the middle and Laurent Koscielny to the left side of that back three.